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Sekiguchi, Takashi

Positive approximants of normal operators. (English) Zbl 0331.47004

Hokkaido Math. J. 5, 270-279 (1976).
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MSC:

47A30 Norms (inequalities, more than one norm, etc.) of linear operators
47B15 Hermitian and normal operators (spectral measures, functional calculus, etc.)
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
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